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Finding the Fourth Proportional to 78,685.92, 108,587.16 and 42,876.90

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Solution

The fourth proportional to 78,685.92, 108,587.16 and 42,876.90 is: 59,170.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,685.92 : 108,587.16 = 42,876.90 : x
  2. Step 2: Convert to fraction form
    78,685.92/108,587.16 = 42,876.90/x
  3. Step 3: Cross multiply
    78,685.92x = 108,587.16 × 42,876.90
  4. Step 4: Simplify right side
    78,685.92x = 4,655,880,800.60
  5. Step 5: Solve for x
    x = 4,655,880,800.60/78,685.92
  6. Step 6: Final answer
    x = 59,170.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.